LRRK2 inhibitors

A compound of formula I, or a pharmaceutically acceptable salt thereof, wherein:

• R1 is R4;
• R2 is a C1-C3 alkyl, an isotopically labelled C1-C3 alkyl, a C3-C6 cycloalkyl, or a C1-C3 haloalkyl;
• R3 is halogen, cyano, a O-C1-C3 haloalkyl, a C1-C3 haloalkyl, a C3-C6 cycloalkyl, or a C1-C3 alkyl;
• R4 is a C3-C6 cycloalkyl;
• wherein each cycloalkyl is unsubstituted or substituted with 1, 2, or 3 groups independently selected from the group consisting of cyano, deuterium, halogen, C1-C3 alkyl, an isotopically labelled C1-C3 alkyl, a O-C1-C3 haloalkyl, a O-C1-C3 alkyl, and a C1-C3 haloalkyl.